diff --git a/index.html b/index.html
index a60c812..948abff 100644
--- a/index.html
+++ b/index.html
@@ -383,7 +383,7 @@
 
 		<script src="js/ui/tool/dream.js?v=74c0c1f" type="text/javascript"></script>
 		<script
-			src="js/ui/tool/maskbrush.js?v=1e8a893"
+			src="js/ui/tool/maskbrush.js?v=d88810f"
 			type="text/javascript"></script>
 		<script
 			src="js/ui/tool/colorbrush.js?v=3f8c01a"
diff --git a/js/ui/tool/maskbrush.js b/js/ui/tool/maskbrush.js
index 0b68c4b..3eaef41 100644
--- a/js/ui/tool/maskbrush.js
+++ b/js/ui/tool/maskbrush.js
@@ -133,7 +133,7 @@ const maskBrushTool = () =>
 
 				state.movecb = (evn) => {
 					const vcp = {x: evn.evn.clientX, y: evn.evn.clientY};
-					const scp = state.brushSize * viewport.zoom;
+					const scp = state.brushSize / viewport.zoom;
 
 					state.clearPrevCursor();
 					state;